Thermo hydraulic valve



June 16, 195 9 E. E. RICHMOND 2,890,687

THERMO HYDRAULIC VALVE Filed Sept. 29, 1958 4 Sheets-Sheet 1' 4 4d a/ a:WWI F/G 9 m 72 w IF 2 v z I? L w ,3

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4 THERMO HYDRAULIC VALVE Filed Sept. 29, 1958 4 Sheets-Sheet 2 'oIIIII'IIIIIIII I N VEN TOR.

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THERMO HYDRAULIC VALVE Filed Sept. 29. 1958 7 4 Sheets-Sheet 3 5INVENTOR. /v ERlc/molvo ATTEI RN EYE June 16, 1959 E. E. RICHMOND2,890,687

THERMO HYDRAULIC VALVE 4 Sheets-Sheet 4 Filed Sept. 29. 1958 fuss/v5 ERICHMOND ATTORNEYS THERMG HYDRAULIC VALVE Eugene 1E. Richmond, Tavares,Fla.

Application September 29, 1958,.Serial No. 764,031

6 Claims. (Cl. 123-41.12)

This invention relates to fans and other devices particularly of motorvehicle engines, and in particular a thermally actuated valve connectedto the 'oil pressure system of an engine and a fan mounting having afluid pressure cylinder and a clutch therein whereinthe fan is actuatedonly when the temperatures of water of an engine reaches a predetermineddegree, and wherein the operation of the fan is restricted as the speedof the vehicle reaches a predetermined amount, such as 35 miles perhour, at which speed the inrush of air through the hood of the vehicleexceeds air discharged by the fan of the engine thereof.

The purpose of this invention is to control theoperation of differentautomotive fan mechanisms 'to maintain the proper circulation of airthrough the radiator of a vehicle in proportion to load conditions,water temperature and speed, to reduce excessive fan noise and also toreduce the power required to operate fans of internal combustion enginesparticularly with a vehicle traveling at high speed when, due to theinrush of air through the radiator the fan is not required.

In the conventional motor vehicle the fan operates continuously as theengine is operated whereas it is appreciated that in starting the waterof the cooling system is below normal and does not require cooling andwhen a vehicle is traveling at high speed, suchas above 35 miles perhour the inrush of air throughthe radiator and below the hood exceedsthe air discharged by the fan so that under such conditions theoperation of the fan is not required. With this thought in mind thisinvention contemplates means for holding the fan of a motor vehicleengine stationary until water of the engine reaches a predetermineddegree to facilitate starting and also *means for restricting operationof the fan with the vehicle aveling at such speed that the inrush of.air is greater than that discharged by the fan.

The object of this invention is, therefore, to provide means forcontrolling the operation of thediiferent automotive fan mechanismswherein the fan operates only when it is desired to cool theengine orthe water of the cooling system thereof.

Another object of the invention is to maintain the aren't propercirculation of air through the radiator ofan internal combustion enginein proportion to load conditions, water temperature, and speedof thevehicle.

Another important object of the invention'is to reduce excessive fannoise and economize on the power required to operate the fan with thevehicle traveling at high speed and when the fan operation is notrequired.

A further object of the invention is to shorten the warm-up time of aninternal combustion engine byeliminating cold air circulation throughthe radiator resulting from operation of the fan with the engine cold.

A still further object of the invention is to provide a thermal valvethat lends itself toother applications in internal combustion engines inmotor vehicles and where hydraulic forces are used in-relation .totemperature conditions and where electric circuits can be opened andclosed in relation to temperature and hydraulic pressure.

And astill further object of the invention'is to provide a thermal valvefor controlling the operation of a motor vehicle fan in which theapparatus is of simple and ecov nom'ical construction.

With these and other objects and advantages in view the inventionembodies a thermally actuated valve connected to the oil pressure lineof an engine with an outlet connection extended to the crankcase of theengine and-with a pressure line extended to ahydraulic cylinder,

a 'fan mounting in which the hydraulic cylinder-is positioned, a clutchin the mounting, means for connecting pressure line of the valve to thehydraulic cylinder of the fan assembly, and suitablecarns and solenoidsalso for actuating the fan assembly, or mounting.

Other features and advantages of the invention will appear from thefollowing description taken in connection with-the drawings, wherein:

Figure l is a longitudinal section through the thermal .hydraulic valveshowing the connection from the engine oil pressure line, the outletconnection to the crankcase and the pressure connection to a hydrauliccylinder for actuating a fan clutch, partsof the engine housing beingbroken away.

Figure 2 is a view illustrating an assembly of valves for independentlyoperating the device.

Figure 3 is -a section showinga modification wherein the valve issecured by bolts to the engine housing, such .as -in a flangeconnection, instead of being threaded in an opening of the housing.

Figure 4 is a longitudinal section through the fan vmounting showing thehydraulic cylinder and clutch therein and with parts broken away.

Figure 5 is a modification showing a cross section through one of theblades of the fan, and in which a reversely disposed flange is providedon oneedge-of'the fan blade.

Figure 6 is a longitudinal section through the fan mounting showing amodification wherein the clutch is wherein the cams are positionedbetween thrust and radial bearings, parts of the device being brokenaway. Figure 10 is a longitudinal section through the fan mountingassembly illustrating a further modification wherein the parts areactuated by solenoids.

Figure 11 is a longitudinal section through the fan mounting showing afurther modification wherein thehydraulic cylinder is spacecd outwardlyfrom the force transmitting element, parts being broken away.

Figure 12 is also a longitudinal section through the fan mountingshowing the fan assembly mounted on the pump shaft by spaced rollerbearings, controlling both pump and fan when desired.

Referring now to the drawings, wherein like reference characters denotecorresponding parts'the improved thermal hydraulic valve which is usedwith all units and which is illustrated, particularly in Figure 1,includes a valve body 1% having .a cylinder 11 therein, an upper piston12 positioned in the cylinder andhaving a cup washer l3 thereon, a lowerpiston 14 also positioned in the cylinder and having a cup washer 15thereon, a thermal unit 16 having a stem- 17 extended upwardlytherefrom, avalve 18 positionedsin the upper part-of the 64 extendedfrom a disc 65.

4, including a shaft 25 extended from a conventional water pump 26, ahub 27 mounted on the shaft 25, on

'the'outer end of which a flange 28 is positioned, a pressure cylinder29, a clutch 30 actuated by an annular channel-shaped piston 31 in ahousing 32, a fan 33 secured by bolts 34 to a collar 35 of the fanassembly and rotatably mounted by a bearing 36 on a sleeve 37 extendedfrom the hub27, a pulley 38 carried by a frustro-conical shaped hub 39which is secured to the flange 28 by bolts 40, under the heads of whichare lock washers 41.

With a threaded nipple 42 on the lower end of the valve body threadedinto an opening 43 in a housing 44 of a water jacket 45 whereby thethermal unit 16 is positioned to be influenced by the temperature of thewater jacket the valve operates in a conventional manner with the watercold whereby oil under pressure from the engine passes through theconnecting tube through an opening 46 in a bushing 47 threaded in theopening 19 at the upper end of the valve body, the oil passingdownwardly as indicated by the arrows into an annular recess 48 andpassing from the recess through a passage 49 into a passage 50 in thevalve 18 and continuing from the passage into the upper end of thecylinder 11 from which the oil passes through orifices 51 in a sleeve 52from which the oil passes through a bore 53 in the sleeve into a crosspassage 54 in a collar 55 on the intermediate portion of the sleeve 52,the oil passing into a cylinder 11 and from the cylinder through apassage 56 to a connection 22 to carry the oil back to the crankcase ofthe engine. The tube forming the connection 22 is mounted in the valvebody 10 by a plug 57 which is threaded in the opening 21.

With the water relatively cool and with the parts of the valve in theposition shown in Figure l the oil pressure is recirculated and the fanremains stationary.

' Upon the temperature of the water in the water jacket rising thethermal unit 16 forces the stem v17 upwardly carrying the lower piston14 across the opening 56, closing said opening and driving the upperpiston 12 above a passage 58 to the connection 24 wherebythe oil underpressure is carried to the cylinder 29 which drives the annular piston31 toward the fan actuating the clutch 30 and thereby causing the fan torotate. By this means the fan rotates only when it is desired to reducethe temperature of water in the water jacket of the engine.

The thermal unit 16 is positioned between a lower spring ring 59 in anannular groove 60 and an upper spring ring 61 in an annular groove 62and the upper end of the stem 17 is positioned in a socket 63 in asleeve The lower piston 14 is positioned on a pin 66 extended downwardlyfrom the lower end of the collar 55 and the sleeve 52 extends upwardlyfrom the upper side of the collar. The sealing or cup piston washer 13on the upper end of the upper piston 12 is provided with a disc 67 thatis positioned to engage a flange 68 of a sleeve 69 in which orifices 70,which are in registering relation with thelorifices 51 of the sleeve 52,are positioned, and as shown in Figure l, the lower end of the sleeve 69is seated upon a shoulder 71 spaced from the upper end of the sleeve 52.A balancer spring lower end being seated upon the disc 67 at the upperend of the packing element 13 at the upper end of the upper iston.

p In addition to the valve 18 in the cap 74 at the upper end of thecylinder a check valve including a ball 76 urged against a seat 77 by aspring 78 is also provided, the seat 77 being in the lower portion of abore 79 extended from the annular recess 48. The upper end of the sleeve52 is provided with a plug 80 that is positioned to move upwardly withthe sleeve to engage the ball 76 to unseat the ball thereby opening thelower end of the portion 79 of the bore of the cap to the interior ofthe cylinder 11.

The valve 18includes a cylindrical element rotatably mounted in a bore81 and the passage 50 extends through the element to bypass the checkvalve formed with the ball 76 when water of the engine is cold.

The cylindrical valve element 18 is provided with an arm 82 havingspaced openings 83 therein and the end of the arm is slidably mounted onthe accelerator or throttle actuating rod 84 and positioned betweencollars 85 and 86 which are set to regulate the movement of the valveelement 18. The said collars 85 and 86 are provided with conventionalset screws 87. The valve element 18 is also provided with a crosspassage 88 that is positioned to provide communicating means with thepassage 49 with the valve element 18 turned to an angle of whereby oneend of the passage 50 is in registering ,relation with an opening 89between the cylinder 81 and bore 79 of the cap 74.

The fan assembly, as illustrated in Figure 4 is connected by the tube 24to the valve cylinder 11 whereby oil under pressure is applied to theannular cylinder 29, the end of the ,tube 24 being secured by a coupling90 which is threaded on the upper end of a plug 91 threaded in anopening 92 of a boss 93 of the housing 32 in which the cylinder 29 'ispositioned.

The annular cup piston 31 is mounted ahead of pressure ring 94 with pins95 and the pins extend from studs 96 around which springs 97 arepositioned. Pressure applied to the cylinder 29 compresses the springs97 urging the studs 96 toward the ball bearings 98 and opposite sides ofthe bearing contact rods 99, with attached pressure rings 100 which urgea friction through discs 101 against a driving friction disc 102 of acollar 35 on which the fan blades 33 are secured by the bolts 34. In thedesign illustrated in Figure 4 the shaft 25 extends from a water pumpassembly 26 with the hub 27 of the flange 28 secured to the shaft 25 bya set screw 103. The ball bearing 36 is clamped against a shoulder 104of the sleeve 37 at the end of the hub 27 by a cap screw 105 under thehead of which is a washer 106. The cap screws 34 are threaded in theflange of the collar 35 with lock washers 107 between the heads of thecap screws and web of the -fan and the screws also secure a cylindricalguard 108 over the clutch disc, as shown in Figure 4. The guard '108 isprovided with an inwardly extended annular flange 109 through which thecap screws extend.

The rods 99 are urged to releasing positions by springs 110 large endsof which are positioned in recesses 111 of the flange 28 and theopposite ends of which are retained by washers 112 on recessed pins 113that extend from the rods 99, the washers 112 being retained in positionby heads 114. The ball bearings 98 are provided with annular sleeves orguards 115 for retaining grease in areas around the balls. The ballhearing assembly is enclosed in a cylindrical housing 116 which isprovided with an inwardly extended flange 117 through which cap screws118 extend and the cap screws, which extend through a ring 119 arethreaded in a flange 120 of the housing 32.

I The shaft 25 which extends from the end of the water pump ls-providedwith a ball bearing 121 that is positioned in a sleeve 122 extended fromthe pump and the section 121 is retained in the sleeve 122 by a springwasher 123 in an annular groove 124.

Building up of pressure in a cylinder 11 with the temperature of theassembly unit 16 increased opens the passage 58 whereby oil underpressure passes through the connection 24 to the cylinder 29 driving thepiston 31 with the annular washer 94 toward the clutch causing thefriction clutch disc to engage whereby the fan is rotated with therotation of the water pump. Upon dropping of the temperature of thewater of the water jacket of the engine the pistons 12 and 14 are urgeddownwardly by the spring 75 whereby the piston 12 closes the passage 58relieving the pressure against the friction disc so that rotation of thefan is terminated.

As illustrated in Figure 2 the valve may also be provided with aseparate control valve 125 having a pressure oil line connection 126 tothe engine, a constant oil pressure line 127 to a valve cap 128, similarto the cap 74 of the valve body and a variable pressure line 129 whichextends to a passage 130 in the cap 128, similar to an orifice 131 ofthe valve cap 74. The valve 125 is positioned in a valve body 132 andthe valve element 125 is provided with an arm 133, similar to the arm 82of the valve 18. The connection 126 opens into a passage 134 which isconnected to the connection 127 with passages 135 and 136 with the valvemember 125 in the position shown. By this means constant oil pressure isapplied to the valve 128. At the same time oil is supplied through thepassage 137 of the valve 125 through an opening 138 that providescommunication between the valve element and connection 129 which extendsthrough a passage 139 to the passage 130. The connection 127 opens into.a recess 140, similar to the recess 48 in the cap 74 of the yal've 10and a check valve 141 is provided in this connection.

A modification is illustrated in Figure 3 wherein instead of thethreaded nipple 42 on the lower end of the valve body 10 a valve body142 is provided with a flange 143 and a cap screw 144 extends throughthe flange 143 and is threaded into a housing 145 of a water jacket ofan engine. In this design a gasket 146 is provided between the flange143 and wall 145 of the water jacket and a thermal unit 147, similar tothe thermal unit 16 is positioned between the spring rings 148 and 149.

In the design illustrated in Figures 6, 7, and 8 the fan blades areactuated by springs to feathering positions wherein with the water coldthe fan blades are positioned substantially in a common plane Whereas asthe temperature of the water increases the fan blades are positioned atangles to the plane thereby making it possible to supply air to theengine or water jacket thereof in proportion to the temperature of waterof the cooling system of the engine.

In this design the fan blades 150 carried on the outer ends of shafts151 are actuated to operating positions by cams 152 which are secured onthe shaft by set screws 153, as shown in Figure 8. The cams arepositioned to be engaged by the heads 100 of the rods 99, of the designshown in Figure 8, the rods being actuated by the pistons 31 of thecylinder 29 through the bearings 98 and studs 99. The bearings areslidably mounted on a sleeve 154 and as pressure is applied to thecylinder 29 the bearings force the rods 99 outwardly whereby the heads1% actuate the cams 152 from the position shown in full lines in Figure8 to the position indicated by the broken lines.

The shafts 151 on which the fan blades are positioned are rotatablymounted in a housing 155 carried by a sleeve 156, similar to the sleeveor hub 27, the inner ends of the shafts being mounted with bearings 157'in the head 155 and the outer portions being rotatably mounted in a ring158 with bearings 159.

The assembly in which the cams are used is provided with springs 168,the outer ends of which are anchored in the heads or hub 155 of the fan,as shown at the point 161 and the opposite ends of which are secured inopenings 162 in the shaft .where'by upon release of the 8 cams 152 thefan blades are actuated by the springs to inoperative positions.

The cam assembly is enclosed in a casing 163 which is provided with amounting flange 164 and the flange 164 is secured to a flange 28 of thehub that is similar to the hub 27 by cap screws 165, similar to the capscrews 40, and the center portion of the casing is secured by a capscrew 166 that is threaded in the outer end of a bore 167 of the head orhub 156. The fan blades 150 are secured by suitable fasteners such asthe rivets 168 in slots 169 in ends of the shaft 151 and provided withopenings 170 in which the rivets or fasteners are positioned. The capscrews 165 are threaded in openings 171 of the flange 28.

In Figure 6 the fan blades 150 are shown in angularly disposed positionsin which the blades are held by fluid under pressure in the cylinder 29and in Figure 9 the fan blades are illustrated in released positionswherein the fan rotates without circulating air over the engine or waterjacket thereof.

In the design illustrated in Figure 10 a fan assembly, as illustrated inFigure 6, is mounted in a head or hub 172 similar to the head or hub 155and the cams are actuated by heads 173 of rods 174, similar to the rods99. The rods 174 are actuated by solenoids 175 which force a flange 176against the bearings 177, similar to the bearings 98, and the bearingsurge the rods 174 and heads 173 against the cams or clutch elementcompressing the springs 118. In this design oil under pressure from theengine actuates a pressure switch 178 whereby, with the ignition switch179 closed a circuit is completed from a battery 180 of the vehicle tothe solenoid, one terminal of the battery 180 being grounded, as shownat the point 181, and opposite terminals of the solenoids beinggrounded, as shown at the points 182. The circuit may include an ammeter183 and a warning light 184 that is connected by a wire 185 to a wire186 extended from the battery to the solenoid, and also to a ground 187whereby the light indicates that the solenoids are actuating.

By this means the fan may be actuated by the blades feathering tocompensate for different temperatures of water desired.

The design illustrated in Figure 11 is similar to that shown in Figure10 except that two cylinders 188 are used instead of solenoids of thedesign shown in Figure 10, in which a cup piston having a thrust washer189 thereon is positioned and the piston 190 actuates a flange 191through studs 192, similar to the studs 96 when the flange is mountedsimilar to the flange 176 whereby pressure in the cylinder urges theflange and the thrust bearing 193 against the ends of rods 195 similarto the rods 99. The rods 195 operate the friction disc of a clutch oractuate the cams 152, as may be desired. Springs 196 are positioned onthe studs 192, providing means for urging the piston toward the releasedposition when the pressure is relieved. The fluid is applied through thetube 197, similar to the tube 24 and the tube is connected to thehousing by a plug 198, the inner end of which opens into a recess 199that is in communication with the cylinder 188 by means of a passage208.

The design illustrated in Figure 12 is similar to that shown in Figure 4except that a hub 281, similar to the hub 27, is rotatably mounted bybearings 282 and 203 on a shaft 204, similar to the shaft 25. Thisdesign controls both the fan and the pump simultaneously.

In the design, shown in Figure 12, a hub 205 of a fan 206 is secured tothe end of the shaft 284 by a key 207 and a cap screw 208, under thehead of which is a lock washer 209.

In the design shown in Figure 12, pressure is applied to a clutch 210,similar to the clutch 30 of the design shown in Figure 4 by a pressurecylinder 211 connected to the oil pressure system of the engine by atube 212,

similar to the tube 24 and the cylinder is provided with an annularpiston having a pressure ring 213, studs 214, ball thrust bearings 215and rods 216 on the ends of which are pressure rings 217 that bearagainst friction discs of the clutch. The shaft 204 extends fromlballbearing portion 2180f the water pump 26, the portion 218 being retainedin a sleeve 219 extended from the pump, by a spring washer 2 20. p

The shaft 204 is provided 221 that is positioned in an annular recess222 and the shaft is provided with a spacer sleeve 22 3 for retainingthe hearings in spaced relation. The parts are assembled in a housing224, similar to the housing 32 and the inner portion of. the housing isprovided with an extension sleeve 225, similar to the sleeve 154., Also,as shown in Figure 12 spacing sleeves 226 and 227 are provided at theends of bearings 202 and 203, respectively. In the modificationillustrated in Figure a fan blade 228 is provided with a hook likeflange, 229 to retard the free spinning of the fan with forward motionof the vehicle when the fan is not in use.

Operation Upon starting the motor or engine oil is forced from the motorthrough the tube into the upper end of the valve and, assuming that theengine is cold, the oil flows through the orifice 50 of the valve 18from the passage 49 passing through the openings 51 and 70 into thepassage 53 from which the oil, as indicated by the arrows is returned tothe crankcase of the engine through the tube 22.

Upon operation of the engine the temperature of the water rises and thewarm water coming in contact with the thermal unit 16 causes the stem 17to move upwardly forcing the lower piston 14 and the upper piston 12upwardly with the piston 14 closing the opening 56 to the returnconnection 22 to the crankcase and opening the orifice 58 to the tube 24connecting the oil under pressure to the cylinder 29 and the fan startsimmediately. In this movement the upper piston 12 moves upwardinstantly, continuing to move until the disc 67 contacts the flange 68in the meantime, the balancer spring 72 is compressed holding pistons 12and 14 in this position unless valve 18 is closed, and it closed themovement continues and member 80 unseats the ball 76 opening the checkvalve permitting direct passage of the oil under pressure through thepassage 53 into the area between the pistons and to the fan mounting orassembly through the tube 24.

This condition would occur only under sudden abnormal loads wherecooling action of fan has not yet taken effect. The by-pass valve wasincorporated in design to prevent over heating in such a situation.

In the fan mounting fluid under pressure forces the piston 31 toward theclutch transmitting the force through the thrust bearing 98 and rods 99to the friction disc 101. With the clutch disc in engagement the fan isrotated and the fan continues to rotate as long as air is required forcooling the water of the water jacket of the engine.

It is also possible to operate the fan in the conventional manner by thebelt 230 that is trained over the pulley 38, however for such use thebolts 34 should be longer to compress the clutch plates to the drivingposition.

The fan may also be actuated by the cam assembly or by the solenoid, asmay be desired.

It will be understood that other modifications, within the scope of theappended claims, may be made in the design and arrangement of the partswithout departing from the spirit of the invention.

What is claimed is:

l. A thermal hydraulic valve comprising a valve body having alongitudinally disposed bore providing a cylinder, the cylinder having aconnection for receiving .oil under pressure from an engine, .aconnectionthrough with a spring locking ring "which oil is returned tothe crankcase of the engine and "fan mounting, and means in the fanmounting positioned to receive fluid from the connection of the valvebody to the fan mounting for actuating the fan.

2. A thermal hydraulic valve comprising a valve body having a boreproviding a cylinder therein, a piston in the cylinder, resilient meansfor urging the piston downwardly, 'a tube extended from one end of thecylinder for connecting the cylinder to oil under pressure of theengine, an outlet connection at one side of the cylinder for carryingoil under pressure to the crankcase of the engine, a foot actuated valvein the upper part of the valve body and positioned to open the tube foradmitting oil under pressure of the engine to the return connection tothe crankcase, a water pump, a fan mounting carried by the water pump, afan rotatably mounted on the fan mounting, means operatively connectingthe fan to pressure responsive means in the fan mounting, a tubeconnecting the pressure responsive means of the fan mounting to thevalve body, a thermal unit in the lower end of the cylinder of the valvebody and means actuating the piston of the cylinder to admit oil underpressure from the engine lubricating system to the pressure responsiveelement of the fan mounting for rotating the fan as temperature of thecooling water of the engine uses.

3. A thermal hydraulic valve comprising a valve body having alongitudinally disposed bore extended therethrough providing a cylinder,a lower piston positioned in the cylinder, an upper piston alsopositioned in the cylinder, a thermal unit in the lower end of thecylinder and having a stem positioned to engage the lower piston forcontrolling positions of the pistons to compensate for temperatures ofwater of the water jacket of the engine, an outlet connection extendedfrom one side of the valve body to the crankcase of the engine, an inletconnection extended from the upper end of the valve body to the oilpressure system of the engine, a check valve in the inlet connection inthe upper end of the valve body, a valve positioned to providecommunicating means between the oil pressure system of the engine andthe outlet connection of the valve body, means connecting the valve inthe connection between the oil pressure system of the engine and outletconnection to the throttle valve actuating elements of the engine, awater pump having a shaft extended therefrom, a fan mounting assembly onthe shaft extended from the water pump, a cylinder in the fan mountingassembly, a connection extended from the cylinder of the fan mountingassembly to the cylinder of the valve body, a fan mounted on the fanmounting assembly, a friction clutch in the fan mounting assembly andpositioned to be actuated by the cylinder to cause rotation of the fanupon rotation of the shaft of the water pump and a pulley carried by thefan mounting assembly.

4. In a thermal hydraulic valve, the combination which comprises a valvebody having a longitudinally disposed bore extended therethroughproviding a cylinder, means for mounting the valve body on the waterjacket of an engine having a water pump, an upper piston slidablymounted in 'the cylinder of the valve body, resilient means for urgingthe upper piston downwardly, a lower piston slidably mounted in thecylinder of the valve body and spaced from the upper piston, a thermalunit positioned in the lower end of the valve body and operativelyconnected to the lower piston in the cylinder thereof, a check valve inthe upper end of the valve body for preventing passage of fluid into theupper end of the cylinder, means on the upper piston for unseating thecheck valve, a .tubeextended from, theupper end of the valve body forconnecting the cylinder with the oil pressure system of the engine, atube extended from one side of the valve body providing an outlet to thecrankcase of the engine, a valve actuated by the foot throttle of theengine for opening the connection of the oil pressure system of theengine to the outlet and the crankcase when water of the water jacket ofthe engine is cold, a fan assembly mounted on the shaft of the waterpump, a cylinder in the fan assembly, a connection from the cylinder ofthe fan assembly to the valve body whereby oil under pressure of theengine is supplied to the cylinder of the fan assembly, and meansoperatively connecting the cylinder of the fan assembly to the fan forrotating the fan.

5. In a thermal hydraulic valve, the combination which comprises a valvebody having a longitudinally disposed bore extended therethroughproviding a cylinder, means for mounting the valve body on the waterjacket of an engine having a water pump, an upper piston slidablymounted in the cylinder of the valve body, resilient means for urgingthe upper piston downwardly, a lower piston slidably mounted in thecylinder of the valve body and spaced from the upper piston, a thermalunit positioned in the lower end of the valve body and operativelyconnected to the lower piston in the cylinder thereof, a check valve inthe upper end of the valve body for preventing passage of fluid into theupper end of the cylinder, means on the upper piston for unseating thecheck valve, a tube extended from the upper end of the valve body forconnecting the cylinder with the oil pressure system of the engine, atube extended from one side of the valve body providing an outlet to thecrankcase of the engine, a valve actuated by the foot throttle of theengine for opening the connection of the oil pressure system of theengine to the outlet and the crankcase when water of the water jacket ofthe engine is cold, a fan assembly mounted on the shaft of the waterpump, a cylinder in the fan assembly, a connection from the cylinder ofthe fan assembly to the valve body whereby oil under pressure of theengine is supplied to the cylinder of the fan assembly, pressureactuated means in the fan assembly for connecting the fan to the shaftof the water pump whereby the tan is rotated by the water pump, and apulley carried by the fan assembly.

6. In a thermal hydraulic valve, the combination which comprises a valvebody having a longitudinally disposed bore extended therethroughproviding a cylinder, means for mounting the valve body on the waterjacket of an engine having a water pump, an upper piston slidablymounted in the cylinder of the valve body, resilient means for urgingthe upper piston downwardly, a lower piston slidably mounted in thecylinder of the valve body and spaced from the upper piston, a thermalunit positioned in the lower end of the valve body and operativelyconnected to the lower piston in the cylinder thereof, a check valve inthe upper end of the valve body for preventing passage of fluid into theupper end of the cylinder, means on the upper piston for unseat-ing thecheck valve, a tube extended from the upper end of the valve body forconnecting the cylinder with the oil pressure system of the engine, atube extended from one side of the valve body providing an outlet to thecrankcase of the engine, a valve actuated by the foot throttle of theengine for opening the connection of the oil pressure system of theengine to the outlet and the crankcase when water of the water jacket ofthe engine is cold, a fan assembly mounted on the shaft of the waterpump, a cylinder in the fan assembly, a connection from the cylinder ofthe tan assembly to the valve body whereby oil under pressure of theengine is supplied to the cylinder of the tan assembly, meansoperatively connecting the cylinder of the fan assembly to fan bladesthereof, and means regulating the connecting elements connecting thecylinder of the fan assembly to the blades whereby the blades arefeathered to compensate for temperature of water in the water jacket ofthe engine.

References Cited in the file of this patent UNITED STATES PATENTS1,644,708 Blackmore Oct. 11, 1927 2,553,214 Sanders May 15, 19512,652,816 Dodge Sept. 22, 1953

